Furnace



March 10, 1936.

.C. L. SHRUM FURNACE Filed April 8, 1935 Fig.4

3mm Chas. L. 5hrum Patented Mar. 10, 1936 FURNACE Charles L. Shrum, Fremont, Nebr.

Application April 8, 1935, Serial No. 15,190

radiators so that all of the gases of combustion 2 Claims.

My invention relates to furnaces, its primary object being the provision of. a furnace which will utilize the maximum amount of heat in the fuel.

Another of my objects is the provision of a furnace having a plurality of radiators through which the hot gases of combustion may be conducted so as to provide the maximum amount of heating surface.

Another object of the invention is the provision of a horizontal passageway for the gases of combustion and so arranged that this passageway will trap solid materials which do not pass out through the flue so that they may readily be re moved from the passageway.

Another object which I have in View is the provision of a plurality of arched radiators which are spaced apart and which are provided with conduits between adjacent radiators so that the gases of combustion may be conducted directly to the fiue whenever the fire is low.

Another of my objects is the provision of a humidifier which is positioned at the most effective point of the furnace.

Having in view these objects and others which will be pointed out in the following description, I will now refer to the drawing, in which Figure 1 is a perspective view in section of the far side of the furnace.

Figure 2 is a perspective view of. the near side of the furnace.

Figure 3 is a view drawn to a reduced scale showing the furnace in diagram.

Figure 4 is a sectional View on the line 4-4 of Figure 3.

Figure 5 is a sectional View on the line 5-5 of Figure 3.

The fire box I0 is rectangular in form and it is provided with an arch or dome. An opening II in the arch or dome permits the upward passage of the gases of combustion from the fire box In. For controlling the movements of the gases of combustion passing through the opening H I provide a plurality of radiators l2, l3, and I4. While only three of these radiators are shown it is obvious that the number may be either increased or decreased at will. Each of these radiators except the radiator I2 is provided with a circular opening l5, these circular openings being in alignment and being connected by means of the cylindrical conduits It as shown in Figure 3. The radiators are spaced apart to increase the heating surface and this heating surface is further increased by the provision of the cylindrical conduits IS. The slotlike opening II in the fire box is also closed in the portions between adjacent are forced into the radiators. A gas passage N forms the rear of the furnace, this member being also provided with openings at its front and rear as shown in Figure 1. The rear opening has a usual collar for the connection with the furnace pipe which conducts the products of combustion to the chimney. It should be noted that all of the apertures are in horizontal alignment as shown in Figure 3 so that the smoke may travel in a direct horizontal path to the furnace pipe.

On each side of the furnace is a horizontal smoke conduit 28. The vertical tubular conduits i9, join the radiators l2, l3, and M with the conduits 18 so that the smoke and other products of combustion may be carried out through the conduits l8. The conduits l3 discharge these gases into the interior of the member I! from which they are carried off through the furnace pipe as shown in Figure 3. The gases leaving the fire box l8 will naturally follow the course of least resistance so that they would normally pass through the conduits l6 and directly into the furnace pipe without reaching the conduits I8. A damper 26 is therefore inserted in the conduits l6 between the radiator is and the member l! to prevent the passage of smoke from the radiator E4 in a direct path to the furnace pipe. This forces the hot gases from the radiators l2, l3, and M to move downwardly to the conduits it from whence they may pass through the member H as shown in Figure 3 and out through the furnace pipe.

The damper 26 may be provided with any suitable control for opening and closing the damper. When the fire is low the damper 26 may be opened to increase the draft of the furnace and it may then be closed in order to increase the heating surface.

The furnace is provided with the usual furnace jacket with means for discharging the heated air into the living rooms. This jacket is rectangular in form to conform to the shape of the furnace and it may be ornamented in any suitable manner for the new style habitable basements. As a part of the jacket a. fragment of the front wall 2! is shown in Figure 2. This has the usual ash pit door 22 with a hinged draft door 23, a fuel door 25 and a humidifier door 25, this last named door being designed to give access to the water pan 25a. The humidifier is positioned at the front of the furnace and at a height such that full advantage is taken of both the heat of the furnace and the air currents established between the furnace and the jacket.

The radiators l2, l3, and M are arched in such a way as to prevent the accumulation of fine ashes and soot and other particles which frequently cause trouble in furnaces. They do not adhere to the walls of the radiators but some of this foreign matter is carried through by the draft from the fire box Ill and it passes downwardly through the conduits IS. The velocity of flow is checked in the conduits 18 so that any such foreign matter would accumulate in the conduits I 8. These conduits are therefore provided with clean out doors 26 at the front of the furnace so that any foreign matter may easily be removed from the conduits l9.

From the above description it will be apparent that the maximum heating surface in relation to the grate area is provided. The hot gases and smoke discharge their heat into the walls of the radiators so that the heat becomes practically exhausted on reaching the member 11. This long, bafiled, balanced fire travel equalizes heat radiation from the furnace.

Having thus described my invention in such full, clear, and exact terms that its construction and operation will be readily understood by others skilled in the art to which it pertains, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A furnace including a fire box, a plurality of radiators projecting from the top of said fire box for receiving the products of combustion therefrom, said radiators being curved first upwardly and outwardly in both lateral directions and then downwardly, an upper smoke conduit leading rearwardly from the rear one of said radiators, a pair of lower substantially horizontal smoke conduits at the opposite sides of said fire box, said lower smoke conduits extending rearwardly and terminating in a vertical smoke conduit communicating with said upper smoke conduit, said radiators being each provided with depending vertical conduits and being spaced apart and having plane front and rear walls, smoke conduits between said radiators and in horizontal alignment with said upper smoke conduit, and a damper for directing the smoke either through said lower horizontal smoke conduits to said upper smoke conduit or directly through said conduits between said radiators to said upper smoke conduit.

2. A furnace including a fire box, a plurality of spaced apart radiators straddling said fire box and each having the form of an inverted U with the middle portion thereof in communication with said fire box for receiving the products of combustion therefrom, a substantially horizontal lower smoke conduit at each side of said fire box, said radiators each communicating with both of said lower smoke conduits, a smoke conducting chamber in the rear of said fire box and communicating with said lower smoke conduits, upper conduits between said radiators and between the rear one of said radiators and said smoke conducting chamber for conducting the smoke rearwardly through each of said radiators and into said smoke conducting chamber, said upper conduits being in horizontal alignment, and a manually operable damper between said smoke conducting chamber and the rear one of said radiators whereby the smoke will be conducted either directly through said upper conduits to the upper portion of said smoke conducting chamber or downwardly through said radiators and through said lower smoke conduits to the lower portion of said smoke conducting chamber, and a furnace pipe communicating with said smoke conducting chamber for conducting the smoke away from said furnace.

CHARLES L. SHRUM. 

